nfs-utils: decrease RLIMIT_NOFILE to 4k for systemd

On systemd, it set RLIMIT_NOFILE to 512k, since do_testimage
for core-image-sato-sdk has memory limitation (256Mib) which
caused rpc.statd failed with out of memory.
[  531.306146] Out of memory: Kill process 193 (rpc.statd) score 200 or sacrifice child

The rpc.statd and rpc.mountd allocates memory according to
RLIMIT_NOFILE, so decrease it to 4k to keep sync with sysvinit

After applying the patch, the memory cost is the same with sysvinit:

root@qemux86-64:~# systemctl status nfs-statd
* nfs-statd.service - NFS status monitor for NFSv2/3 locking.
   Loaded: loaded (/lib/systemd/system/nfs-statd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2019-08-20 03:16:18 UTC; 3min 26s ago
 Main PID: 343 (rpc.statd)
    Tasks: 1 (limit: 271)
   Memory: 1.0M

root@qemux86-64:~# systemctl status nfs-mountd
* nfs-mountd.service - NFS Mount Daemon
   Loaded: loaded (/etc/systemd/system/nfs-mountd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2019-08-20 03:19:01 UTC; 1min 21s ago
 Main PID: 451 (rpc.mountd)
    Tasks: 1 (limit: 271)
   Memory: 736.0K

Suggested-by: Chen Qi <qi.chen@windriver.com>
(From OE-Core rev: 6d61cd2bdc9e326eaa59082b5dd7423e522b96d3)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/nfs-utils/nfs-utils/nfs-statd.service b/meta/recipes-connectivity/nfs-utils/nfs-utils/nfs-statd.service
index 6e196b8c8c..4fa64e1998 100644
--- a/meta/recipes-connectivity/nfs-utils/nfs-utils/nfs-statd.service
+++ b/meta/recipes-connectivity/nfs-utils/nfs-utils/nfs-statd.service
@@ -8,6 +8,7 @@ After=network.target nss-lookup.target rpcbind.service
 [Service]
 EnvironmentFile=-@SYSCONFDIR@/nfs-utils.conf
 ExecStart=@SBINDIR@/rpc.statd -F $STATD_OPTS
+LimitNOFILE=@HIGH_RLIMIT_NOFILE@
 
 [Install]
 WantedBy=multi-user.target